Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a0602ea78575a2…

MALICIOUS

PDF

86.6 KB Created: 2021-08-08 17:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 169b4579e7b33b00416ad81e8504c02e SHA-1: 1b95fef32060f7c454397d7e6cfb595a39a84b61 SHA-256: 52a0602ea78575a237d86cb1956e53c2a5a9c6b3f99dddb36f81127bddec403a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa45576dc0d---mawufu.pdf In PDF document text
    • https://clinicscrm.com/img/files/4629017257.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/wedesozepasabo.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/bumetuzifozalagovuzenabe.pdfIn PDF document text
    • http://strap.sk/uploads/files/61478258673.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/93661083144.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/52938966430.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1a9f39eb5---77184952097.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35ca7ddc49---60602236343.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28510307954.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/e9a87cd2bb51a769354aca8d6e36fe35/2944293494.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088633149e5d---wesoreb.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fa27e046---lexarejodiravimidafix.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4dbb192df---buzulezijutomafalonuwa.pdfIn PDF document text
    • http://ctm.it/userfiles/file/90143588893.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6a87c3d0---jotofitetuzateroxod.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tji9jm4hsan7il644705qf24cg/kibit.pdfIn PDF document text
    • http://sparkpro.lv/content/file/78408836778.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2cc8160d---77973923992.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/69108810829.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/zazigutowalelo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02a0bf6e2---delebuvitivarofisi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073051e25dd9---56323684217.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/767d76b69d0967235826c0aa074e1a33/28881129366.pdfIn PDF document text
    • http://qdjshg.com/files/file/guzesi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/94571147656.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/zojerijorabisorijen.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/57388682462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=carrom+pool+new+version+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 10728 bytes
SHA-256: 70a420ab534692edb4250f26bb4d8c30335a64d7ae68be48cfe2aef2ff144232
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16820 bytes
SHA-256: b34f8624f2ab92e92bbca6a6396c2785e6c9ebc3f27e0d19c62e66b0052456e1
font_02_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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